Radius and angle dresser device

ABSTRACT

A device for dressing the peripheral surface of grinding wheels having a dresser mounted on a spherical element for universal movement with a handle projecting through an adjustable pattern opening to determine the shape on the grinding surface by guiding the movement of the dresser.

United States Patent 1111 3,603,302

[72] inventor Jean Francis Payee [56] References Cited "4 F. w. Moore Rd., St. Clair, Mich. UNITED STATES PATENTS 48079 pp No- 766837 2,313,055 3/1943 De Vileg 125/11 d t 11 1968 2,585,305 2/1952 Prltts l/ll [221 1,784,261 12/1930 Weidner.... 125/11 Paemed sepfl'wn 2,458,768 1 1949 Daily 125 11 Primary ExaminerHar0ld D. Whitehead Attorney-Henry J. Gens ABSTRACT: A device for dressing the peripheral surface of RADIUS AND ANGLE DRESSER DEVICE grinding wheels having a dresser mounted on a spherical ele- 10 Clams Drawing ment for universal movement with a handle projecting [52] U.S. CI 125/ 11 TP through an adjustable pattern opening to determine the shape [5 1 B24b 53/08 on the grinding surface by guiding the movement of the Field of Search /1 1 dresser.

PATENTED SEP 71am SHEET 1 0F 7 IN VENTOR. J 2 0/1 F aypa PATENTED E 7 I97! SHEET 2 OF 7 INVENTOR.

Jean f" Pia m PATENIEDsEP 7m: 3,603.]302

sum 3 or 7 Jean F Payfia PATEN IEU SEP 7 I971 SHEET t 0F 7 JINVENTOR.

Jean 5 a yfa PATENIED SEP 7:971

SHEU 5 0F 7 Jean F Payee;

PATENIEUSEP 7l97l 3, 03,302

sum 6 BF 7 Jean F pa a IN VENTOR.

PATENIED SEP 7 Ian SHEET 7 [IF 7 RADIUS AND ANGLE DRESSER DEVICE BACKGROUND OF THE INVENTION Various machines and devices are known for dressing the peripheral surfaces of grinding wheels. For example, during manufacture of the grinding wheels,- various configurations may be impressed upon the grinding wheels with production machines, but these machines are not capable of dressing the grinding wheels after their surfaces have become worn. Such production machines, even if they were capable of servicing wornout grinding wheels, would be too cumbersome and expensive to be used in the ordinary machine or die shop. Other devices, such as sineplate angle wheel dressers, are capable of dressing the peripheral surface of the grinding wheel in a straight line, across the grinding face of the wheel, for example as disclosed in U.S. Pat. No. 2,378,743. None of the known dressing devices are capable of imparting convex, concave or other intermediate shapes across the grinding face of the grinding wheel.

SUMMARY OF THE INVENTION Briefly described, the present dresser device includes a handle passing through a spherical element mounted on a base, one end of the handles supporting a diamond for dressing the peripheral surface of the grinding wheel and the other end of the handle having a movement which is determined by predetermined openings in a sine bar mechanism which determines angular and pivotal movements, respectively, of both of the ends of the handle, particularly the movement of the diamond as it moves along an arcuate path across the grinding face. The openings in the sine bar mechanism may possess the shapes described herein or may have other shapes, depending on the nature of the arcuate or straight face desired to be dressed on the grinding face.

This invention relates to an improved radius and angle dresser device for dressing wheels and for other machine work.

It is the object of the invention to provide an improved radius and angle dresser device which may be quickly and accurately set up to dress the grinding face of a grinding wheel.

A further object of the invention is to provide an improved radius and angle dresser device which can dress the grinding face of the grinding wheel along a straight or arcuate path.

Further objects and advantages are within the scope of the invention as will be apparent or deduced from the description in the specification and the illustrations in the drawings, wherein;

FIG. 1 is a side elevational view of a radius and angle dresser device for grinding wheels constructed in accordance with the principles of the present invention, as positioned with respect to a grinding wheel shown in fragmentary illustration;

FIG. 2 is an exploded view of the dresser device showing the manner of assembly;

FIG. 3 is a side elevational of a spherical element forming a part of the dresser device;

FIG. 4 is an end view of the truncated portion of the spherical element;

FIG. 5 is a fragmentary illustration of a handle with a stop block mounted thereon;

FIG. 6 is a view of the stop block as viewed from the right side of FIG. 5;

FIG. 7 is a side elevational view of a plunger to engage the groove in the spherical element shown in FIG. 3;

F IG; 8 is a cross-sectional view of the plunger along line 8- 8 of FIG. 7;

FIG. 9 is a plan elevational view of afront housing for supporting the spherical element; 7

FIG. 10 is a sectional view of the front housing along line 10-10 ofFIG. 9;

FIG. 11 is plan elevational view of a back housing for supporting the spherical element;

FIG. I2 is a sectional view of the front housing along line Ill-ll ofFIG. 11;

FIG. 13 is a plan elevational view of an outer retainer for supporting a sine bar mechanism;

FIG. 14 is a sectional view of the outer retainer taken along line l4-14 of FIG. 13;

FIG. 15 is a plan elevational view of an inner retainer for supporting the sine bar mechanism;

FIG. 16 is a sectional view of the inner retainer along line I6I6 of FIG. 15;

FIG. 17 shows an arrangement of the sine bar mechanism for forming a convex surface on the periphery of the grinding wheel;

FIG. 18 shows an arrangement of the sine bar mechanism for forming a concave surface on the periphery of the grinding wheel;

FIG. 19 is a side elevational view of an inner member of the sine bar mechanism;

FIG. 20 is an end view of the inner member, as viewed from the right of FIG. 19;

FIG. 21 is a side elevational view of an outer member of the sine bar mechanism;

FIG. 22 is an end view of the outer member, as viewed from the right of FIG. 21;

FIG. 23 is a plan view of a base for mounting the dresser device;

FIG. 24 is a cross-sectional view of the base along line 24- 24 of FIG. 23; 6

FIG. 25 is a plan view of a slide for supporting a diamond holder;

FIG. 26 is a cross-sectional view of the slide taken along the line 2626 of FIG. 25;

FIG. 27 is a side elevational view of the diamond holder;

FIG. 28 is a plan view of the diamond holder;

FIG. 29 is an end view of a sector nut; and

FIG. 30 is a side elevational view ofthe sector nut.

Referring to FIG. 1, there is shown a radius and angle dresser device 30 comprising a base 32 having mounted thereon a retainer device 34, a back housing 36 and a front housing 38, the latter two having a cavity 40, shown by hidden line, for housing a frustospherical element 42 which is truncated to form a flat face 44 to which is fastened a slide 46 forming a slidable path for a diamond holder 48 including a diamond 50 so that it can be adjusted in a vertical plane with respect to a grinding wheel W. A handle 52, with a part broken off, has one end, as shown in broken line, terminating and firmly attached to the spherical element 42. On the handle, there is mounted a stop block 54 having a finger 56 adapted to engage a sine bar mechanism 58 comprising an inner member 60 which is partly overlapped by an outer member 62, as best seen in FIGS. I7 and 18, in certain positional arrangements. Fastening members 64 pass through sleeves 66 which have shoulders 68 abutting inner and outer members 60 and 62 of the sine bar mechanism 58.

The construction of the diamond holder 48 is shown in FIGS. 27 and 28. The holder has a slide cavity 70 which complementally is adapted to receive the slide 46 which is particularly shown in FIGS. 25 and 26. THe holder 48 has a screw opening 72 for receiving a screw (not shown) which can be tightened to fix the position of the holder with respect to the slide 46.

The slide 46 (FIG. 25) has three screw receiving openings 74 and two dowel openings 76 which enable the slide to be mounted and fastened to the flat face 44 on the spherical element 42, through the complementally formed openings 74a and 76a (FIG. 4). The spherical element 42 (FIG. 3) is provided with a groove 78 which is adapted to receive a plunger 80, as shown in FIGS. 7 and 8, so as to maintain the spherical element in a neutral position when dressing a flat face on the periphery of the grinding wheel W. THe plunger 80 is mounted partially in a cavity 82 in base 32 (FIG. 1) and partially in a cavity 84 formed by a recess 86 in the front housing 38 (FIGS. 9 and 10) and a recess 88 in the back housing 36 (FIGS. 11 and 12). As shown in FIG. 2, the plunger 80 has an internal cavity 90 for admitting a spring (not shown) to urge the plunger into engagement with the groove 78, when the device 30 is in a neutral position.

The front housing 38 is fastened to the base 32 by screws (not shown) passing through openings 92, shown in FIG. 23. Similarly, the back housing 36 is attached by screws (not shown) passing through openings 94 in the base. The retainer device 34 is mounted on the base by screws (not shown) passing through openings 96.

The retainer device 34, FIG. 1, comprises a retainer member 98, FIGS. 13 and 14, housing a ring member 100, FIGS. and 16. The retainer member 98 has two bores 102 and 104 of different diameters forming therebetween a shoulder 106. The ring member 100 is cylindrical in form having two concentric peripheral surfaces 108 and 110 forming a shoulder 112 therebetween. As readily seen in FIG. 2, the peripheral surface 110 and the bore 104, when fitted together, form therebetween a concentric opening 117 (FIGS. 17 and 18) for accommodating extensions 114 and 116, having preferably arcuate shapes, on inner member 60 and outer member 62, respectively, so that the inner and outer members may be moved with respect to each other to achieve a diametrically opposed position, the position shown in FIG. 17, the position shown in FIG. 18, or any other position in between to achieve a particular contouring of the grinding wheel. The peripheral surface 108 on the ring member 100 and the bore 102 in the retainer member 98 form therebetween, when fitted together a concentric opening to accommodate a sector nut 118,

FIGS. 29 and 30, which threadedly receives the inner end of the fastening member 64 (FIG. 1) which can be loosened so that inner member 60 and outer member 62 may be positioned with respect to each other and then tightened. The fastening member 64 passes through the sleeve 66 which passes through the sine bar mechanism and its extension 114 to engage the sector nut 118 which abuts the shoulders 106 and 112 to bind the retainer member 98, the ring member 100, the inner member 60 and the outer member 62 into a unitary assembly. The retainer member 98, FIG. 13, has four bolt openings 120 in its four corners and two dowel openings 122, all of which are axially lined up with bolt opening 120a and dowel openings 122a in back housing 36, FIG. 11, and with bolt openings 120b and dowel openings 122b in front housing 38. Suitable bolts and dowel pins are passed through the foregoing bolt openings and dowel openings to achieve a unitary assembly.

The front housing 38 has screw openings 92a which align with the screw openings 92 in the base 32 (FIG. 23) and the back housing 36 has screw openings 94a which align with the screw openings 92 in the base, the retainer member 98 is fastened to the base 32 (FIG. 1) by a screw (not shown) screwable into an opening. The ring member 100 has three screw openings 124, FIG. 15, and two dowel openings 126 which, respectively align with screw openings 124a and dowel openings 126a in back housing 36, FIG. 11, so that the ring member may be suitably supported by screws and dowel pins on the back housing 36.

ASSEMBLY The handle 52 may be screwed or press fitted into a dead end bore 128, FIG. 2. The stop block 54 is supported by a screw (not shown) on the handle 52. The ring member 100 is fastened as previously described, on the back housing 36. Next, two sector nuts 118 are positioned so that their small arcuate surfaces 130 abut the peripheral surface 108 on the ring member 100. Then, the retainer member 98 is shipped over 'the ring member 100 to entrap the sector nuts with the surface of the bore 102. The retainer member 98 is then attached to the" back housing 36, as previously described. The sleeves 66 are passed' through inner and outer members 60 and 62 and both inserted into the concentric opening 117 (FIGS. 17 and i 18). THe fastening members 64 are then passed through the sleeves 66 to engage threadedly the entrapped sector nuts 118. Hereafter, it is deemed unnecessary to particularly describe further steps of assembly which is rather apparent from the exploded view of FIG. 2.

As shown in FIGS. 1, 17 and 18, the inner and outer members 60 and 62, which are differently constructed, are supported so that they can be rotated in the opening 117 without interfering with each other. THe inner member 60, FIGS. 19 and 20, has a finger 132 and a stub 136 and the outer member 62 has a finger 134 and a stub 138, as shown in FIGS. 21 and 22. The finger 132 and the stub 136 are contained in a vertical plane which is displaced axially from the vertical plane containing the other finger 134 and the stub 138, so that an overlap can occur as shown by the stubs 136 and 138 in FIGS. 17 and 18.

OPERATION If it is desired to dress the grinding wheel so that it will have a convex shape on its periphery, as shown on a grinding wheel W-l in FIG. 17 which also shows a simplified end view of the dresser device of FIG. 1, when looking from the side of the handle 54 to the right, bearing in mind that the disposition of the inner and outer members 60 and 62 in FIG. 17 is not the same as shown in FIG. 1. The base 32 may be placed on some convenient fixture and appropriately secured to keep a fixed position with respect to the grinding wheel W1, for example, as by means of a magnetic chuck. The fastening members 64 (FIG. 1) are loosened so that the inner and outer member 60 and 62 occupy the position shown in FIG. 17, thereafter, the fastening members are tightened. The inner and outer mem bers 60 and 62 are quickly, conveniently and accurately ad justed to any desired angle merely by inserting a gauge block (not shown) between the upper surface of the base 32 and the sleeve 66 (having a known radius) so that an angle A can be visualized between lines 140 and 142 to form a triangle with a line 144. An arrow line 5 indicates the sine of the angle A. The dimension of the gauge block required to be selected for this purpose is conveniently determined from the sine or other function of the desired angle. The distance of the line 140 is known, as previously described. The procedure is to look up the sine of the desired angle on the sine table, or other functions of the desired angles from the sine or other mathematical tables. On solving, the length of the line 144 is equal to the length of the line 140 times the sine of angle A. The distance from the surface of the base to the axis passing through the handle 52 is also known and is represented as S-l-D. The thickness of the gauge block to fit under the sleeve 66 is determined by subtracting S plus the radius of the sleeve 66 from (S+D).

Having set the inner and outer members 60 and 62 at the proper angles, the handle 52 is rotated to position the stop block 54 against the finger 134 on the outer member 62 and then the handle is moved to the left and downwardly generating a handle movement along path a the diamond 50 at this time moving along a path a on the surface of the grinding wheel W-l. During the foregoing movement, the plunger recedes and loses engagement with the groove 78 but retains engagement at all times with the spherical element 42. As the handle is thereafter moved upwardly and to the right the stop block 54 reaches the position as shown in FIG. 17, then the handle 52 is rotated to swing the stop block 54 to the other side to rest against the finger 132. The handle 52 is then moved downwardly and to the right; the handle describes movements along path a, b and c and the diamond moves along the paths a, band c. The opposing movements of the handle and the diamond can be better visualized from Flg. 1 wherein if the inner and outer members 60 and 62 occupied the positions shown in FIG. 17, the movement of the diamond 50 would be opposite the movement of the end of the handle A similar procedure of determining the thickness of the gauge block and the setting of the inner and outer members 60 and 62 would be followed in setting up the dresser device to dress concavely the face of ta grinding wheel W-2 shown in FIG. H8. The end of the handle 52 would generate a movement along paths de andfand the diamond would move along paths d, e'andj.

It is apparent that within the scope of this invention various modifications and arrangements may be made other than that described and shown herein, and the present disclosure is merely illustrative, the invention comprehending variations thereof.

lclaim:

ii. A possible radius and angle dresser device for dressing the grinding face of a grinding wheel, comprising an elongated straight member, a diamond adjustably supported at one end of the elongated member, means for pivotally and rotatably supporting said elongated straight member, an adjustable sine bar mechanism for defining the extent of pivotal movement of said elongated member, said sine bar mechanisms comprising a pair of members provided with bifurcated ends directed toward each other and defining therebetween an opening admitting said elongated straight member, and a single stop member supported on said elongated member and adapted to cooperate with portions of the bifurcated ends to define the extent of rotatable movement of said elongated member, whereby actuation of the other end of said elongated member results in a movement of the diamond in a predetermined path across the grinding face.

2. A device according to claim 1, wherein the means supporting said elongated member comprising a frustospherical element, a back housing, a front housing, both of said housings matedly defining a complementary frustospherical cavity therebetween for supporting said frustospherical element, and a base supporting both of said housings and adapted to be portably mounted adjacent a grinding wheel supported on any grinding apparatus.

3. A device according to claim 2, wherein the frustospherical element is provided with a diametrical groove, both of said housings matedly defining a further cavity therebetween communicating with said frustospherical cavity, a plunger slidably mounted within said further cavity, and means resiliently urging said plunger into engagement with said frustospherical element, whereby the frustospherical element is maintained in a neutral position when the plunger engages said diametrical groove.

4. A device according to claim ll, wherein said pair of members comprises an inner and an outer member, and a retainer device for slidably supporting said members for movement about the longitudinal axis of said elongated member, whereby angular adjustment with respect to the base is obtained.

5. A device according to claim 4, wherein the retainer device comprises a retainer member having a bore and a ring member concentrically mounted within said bore, said retainer member and said ring member defining therebetween a concentric opening, whereby said concentric opening defines a path for slidably supporting said inner end outer members.

6. A device according to claim 5, wherein each inner and outer member includes an extension at one end of said member and extending along the longitudinal axis of the elongated member and a finger at the: other end and extending transversely to said longitudinal axis and directed to said elongated member, said extension passing through said concentric opening, and means for adjustably securing said extension within said concentric opening.

7. A device according to claim 6, wherein said other end includes a stub, a predetermined contour extending between said stub and said finger, whereby positioning said inner and outer members with respect to each other defines an opening between the respective stubs and fingers for limiting the pivotal movement ofsaid elon at ed member.

A device according to c arm 5, including a concentric shoulder in said bore, a peripheral shoulder on said ring member, and a pair of nuts disposed within said bore and abutting both of said shoulders, whereby said inner and outer members are maintained positioned with respect to said retainer and ring members.

9. A device according to claim 2, including a slide supported by said frustospherical element, said slide having a holder for supporting said diamond in a plane passing through the grinding wheel, said holder being slidably mounted on said slide, said diamond being movable in said plane toward or away from said wheel, whereby said holder can be positioned with respect to the longitudinal axis passing through the elongated member.

110. A radius and an angle dresser device for dressing the grinding face of a grinding wheel, comprising an elongated member, a diamond adjustably supported at one end of the elongated member, means for pivotally and rotatably supporting said elongated member, an adjustable sine bar mechanism for defining the extent of pivotal movement of said elongated member, and a stop member supported on said elongated member for defining the extent of rotatable movement of said elongated member, whereby actuation of the other end of said elongated member results in a movement of the diamond in a predetermined path across the grinding face, said means supporting said elongated member comprising a frustospherical element, a back housing, a front housing, both of said housings matedly defining a complementary frustospherical cavity therebetween for supporting said frustospherical element, and a base supporting both of said housings, said frustospherical element being provided with a diametrical groove, both of said housings matedly defining a further cavity therebetween communicating with said frustospherical cavity, a plunger slidably mounted within said further cavity, and means resiliently urg ing said plunger into engagement with said frustospherical ele ment, whereby the frustospherical element is maintained in a neutral position when the plunger engages said diametrical groove. 

1. A possible radius and angle dresser device for dressing the grinding face of a grinding wheel, comprising an elongated straight member, a diamond adjustably supported at one end of the elongated member, means for pivotally and rotatably supporting said elongated straight member, an adjustable sine bar mechanism for defining the extent of pivotal movement of said elongated member, said sine bar mechanisms comprising a pair of members provided with bifurcated ends directed toward each other and defining therebetween an opening admitting said elongated straight member, and a single stop member supported on said elongated member and adapted to cooperate with portions of the bifurcated ends to define the extent of rotatable movement of said elongated member, whereby actuation of the other end of said elongated member results in a movement of the diamond in a predetermined path across the grinding face.
 2. A device according to claim 1, wherein the means supporting said elongated member comprising a frustospherical element, a back housing, a front housing, both of said housings matedly defining a complementary frustospherical cavity therebetween for supporting said frustospherical element, and a base supporting both of said housings and adapted to be portably mounted adjacent a grinding wheel supported on any grinding apparatus.
 3. A device according to claim 2, wherein the frustospherical element is provided with a diametrical groove, both of said housings matedly defining a further cavity therebetween communicating with said frustospherical cavity, a plunger slidably mounted within said further cavity, and means resiliently urging said plunger into engagement with said frustospherical element, whereby the frustospherical element is maintained in a neutral position when the plunger engages said diametrical groove.
 4. A device according to claim 1, wherein said pair of members comprises an inner and an outer member, and a retainer device for slidably supporting said members for movement about the longitudinal axis of said elongated member, whereby angular adjustment with respect to the base is obtained.
 5. A device according to claim 4, wherein the retainer device comprises a retainer member having a bore and a ring member concentrically mounted within said bore, said retainer member and said ring member defining therebetween a concentric opening, whereby said concentric opening defines a path for slidably supporting said inner end outer members.
 6. A device according to claim 5, wherein each inner and outer member includes an extension at one end of said member and extending along the longitudinal axis of the elongated member and a finger at the other end and extending transversely to said longitudinal axis and directed to said elongated member, said extension passing through said concentric opening, and means for adjustably securing said extension within said concentric opening.
 7. A device according to claim 6, wherein said other end includes a stub, a predetermined contour extending between said stub and said finger, whereby positioning SAID inner and outer members with respect to each other defines an opening between the respective stubs and fingers for limiting the pivotal movement of said elongated member.
 8. A device according to claim 5, including a concentric shoulder in said bore, a peripheral shoulder on said ring member, and a pair of nuts disposed within said bore and abutting both of said shoulders, whereby said inner and outer members are maintained positioned with respect to said retainer and ring members.
 9. A device according to claim 2, including a slide supported by said frustospherical element, said slide having a holder for supporting said diamond in a plane passing through the grinding wheel, said holder being slidably mounted on said slide, said diamond being movable in said plane toward or away from said wheel, whereby said holder can be positioned with respect to the longitudinal axis passing through the elongated member.
 10. A radius and an angle dresser device for dressing the grinding face of a grinding wheel, comprising an elongated member, a diamond adjustably supported at one end of the elongated member, means for pivotally and rotatably supporting said elongated member, an adjustable sine bar mechanism for defining the extent of pivotal movement of said elongated member, and a stop member supported on said elongated member for defining the extent of rotatable movement of said elongated member, whereby actuation of the other end of said elongated member results in a movement of the diamond in a predetermined path across the grinding face, said means supporting said elongated member comprising a frustospherical element, a back housing, a front housing, both of said housings matedly defining a complementary frustospherical cavity therebetween for supporting said frustospherical element, and a base supporting both of said housings, said frustospherical element being provided with a diametrical groove, both of said housings matedly defining a further cavity therebetween communicating with said frustospherical cavity, a plunger slidably mounted within said further cavity, and means resiliently urging said plunger into engagement with said frustospherical element, whereby the frustospherical element is maintained in a neutral position when the plunger engages said diametrical groove. 